Linux cli command mailtest

NAME 🖥️ mailtest 🖥️

Simple SMTP sending for diagnostics

SYNOPSIS

mailtest –host host.example.com –rcptto [email protected] [ send_options … ] [ additional recipients …]

Options: –help brief help message –debug enable debugging

–host host host to connect to –rcptto recipient recipient for message –helo machine machine name for EHLO –vrfy request VRFY of recipient –expn request EXPN of recipient –mailfrom from use as MAIL FROM value –from822 from content From: –port port port to connect to –body generate body –include_options include Options in body –include_headers include generated headers in body –tls perform TLS on connect –nostarttls do no attempt STARTTLS –stricttls Enable strict verification on TLS connection –tlsargs arg=value[,arg=value] Explicitly define TLS options. –bounce sending as bounce (<>) –wellknown path well-known path –output file Output file to receive well-known data

OPTIONS

–help
Print a brief help message and exits.

-d, –debug
Enables debugging, outpus additional information whilst processing requests.

-h, –host=host
Specifies the host to connect to. Must be specified and must be IP-resolvable.

-m, –ehlo=machine
Specified the machine name to use as the EHLO value. Defaults to the fully-qualified name of the host running the command.

-r, –rcptto=recipient
Specifies the recipient of message. This is used as the RCPT TO value.

-v, –vrfy
Uses the recipient parameter for the value in a VRFY request. This disables the sending of an email.

-e, –expn
Uses the recipient parameter for the value in an EXPN request. This disables the sending of an email.

-f, –mailfrom=from_address
Specified the value to use in the MAIL FROM command. Defaults to the current username at the FQDN of the machine -m unless the -B option is used.

-u, –from822=from_user
Specified the value to use in the message headers. Defaults to the -f from_address value unless the -B option is used.

-B, –bounce
Replace the –mailfrom from_address with \> and the –from833 from_user with mailer-daemon@host where the host is the value of –ehlo machine

-p, –port=port
Specified the port to connect to on the specified host. Defaults to port 25 unless -S is given in which case it defaults to 465.

-S, –tls
Specifies that TLS be used directly on the connection prior to any SMTP commands. Changes the connection port to 465 unless it has been explicitly provided. Disables any attempts at STARTTLS.

-s, –nostarttls
Disables attempting STARTTLS if offered. Disabled by use of -S.

–stricttls
Enables strict verification of the TLS connection. Sets the underlying SSL option SSL_verify_mode to 1/SSL_VERIFY_PEER rather than 0/SSL_VERIFY_NONE. Since the aim of this tool is to test the SMTP protocol behaviour and not the TLS behaviour the decision was made to default the SSL_verify_mode to 0/SSL_VERIFY_NONE.

–sslargs=argname=argvalue[,argname=argvalue…]
Allow full control over underlying SSL options. Overrides –stricttls. See the documentation for IO::Socket::SSL for further details. –sslargs SSL_verifycn_name=certname.example.com

-b, –body
Generate a body for the message being sent.

-O, –include-options
Include details of options used in the message body.

-H, –include-headers
Include a copy of the generated headers in the message body.

-w, –wellknown=well-known-path
Provides the path value for a WELLKNOWN command.

-W, –output=output_file
Provides the output file where the WELLKNOWN data should be stored.

DESCRIPTION

mailtest is a simple utility for testing SMTP connections. It is designed to debug endpoints and not for full email generation.

It support a number of basic operations, SEND, VRFY, EXPN, WELLKNOWN.

COMPATIBILITY

mailtest only requires modules that should be in all normal distributions.

AUTHOR

Bernard Quatermass <[email protected]>

COPYRIGHT AND LICENSE

This software is Copyright (c) 2008,2020,2024 by Bernard Quatermass.

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